N2 Electrical Trade Theory|The Easy Way! 53


Series motor


Series motor


Compound motor Fig. 3.19 Reversing the field current Exercise 3.4 1. How can the direction of rotation of a dc motor be reversed?


2. What is important to remember when the direction of rotation of a compound wound motor is reversed by field current reversing?


3. Show by means of circuit diagrams, two ways in which the direction of rotation of a shunt wound motor may be reversed?


4. Show how the direction of rotation of a series motor may be reversed.


5. Show one method that can be used to reverse the direction of rotation of a short shunt compound motor.


Compound motor Fig. 3.20 Reversing the armature current


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